Steps to reproduce: 1. Buy a sim card from ALDI for 10€ 2. Activate 3. Use the phone until the balance is down to 0€ At this point you've got an empty balance

Steps to reproduce: 1. Buy a sim card from ALDI for 10€ 2. Activate 3. Use the phone until the balance is down to 0€ At this point you've got an empty balance, are unable to make calls or send texts, but you can receive calls or texts still just fine. You can also visit zero-rated websites (in the past e.g. 0.facebook.com). When I was a child my parents would give me a phone with a SIM card in this state, they could still call me if they needed to tell me to come home, and I could still call the emergency services, and given WiFi I could surf the open web as well, but I couldn't waste money on paid services or calls.